:root {
  color-scheme: light dark;
  --text: #1c1c1e;
  --muted: #6c6c70;
  --bg: #ffffff;
  --card: #f2f2f7;
  --brand: #c2406f;
}
@media (prefers-color-scheme: dark) {
  :root { --text: #f2f2f7; --muted: #a1a1a6; --bg: #000000; --card: #1c1c1e; --brand: #d9548a; }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
  -webkit-text-size-adjust: 100%;
}
main { max-width: 680px; margin: 0 auto; padding: 48px 20px 64px; }
header { margin-bottom: 32px; }
h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 8px; }
h2 { font-size: 1.25rem; margin: 32px 0 8px; }
p, li { margin: 0 0 12px; }
a { color: var(--brand); }
.muted { color: var(--muted); }
.card { background: var(--card); border-radius: 16px; padding: 20px; margin: 16px 0; }
.card h2 { margin-top: 0; }
nav { font-size: 0.95rem; margin-bottom: 24px; }
footer { margin-top: 48px; font-size: 0.9rem; color: var(--muted); }